Books on South America/ German Invasion

Iv searched a lot and cannot find much, but any good books on German plans for South America? I doubt there are books in detail on this specific subject but at least books about Latin American sentiment during WWII or something of the sort? I read Target: America: Hitler's Plan to Attack the United States but it only had about 5 pages on this subject. I believe Marshall said in 1940 5 German divisions could land anywhere in the US and march through the country so am curious about how open South America was to German invasion of America/joining the war.

Thanks in advance.